Skip legacy entry_point tests on Python 3.13+ #588

Job	Run time
bootstrap / setup	3s
pytest / setup	6s
bootstrap / bootstrap (macos-latest, 3.8)	1m 14s
bootstrap / bootstrap (macos-latest, 3.9)	44s
bootstrap / bootstrap (macos-latest, 3.10)	42s
bootstrap / bootstrap (macos-latest, 3.11)	50s
bootstrap / bootstrap (macos-latest, 3.12)	50s
bootstrap / bootstrap (ubuntu-22.04, 3.8)	54s
bootstrap / bootstrap (ubuntu-22.04, 3.9)	53s
bootstrap / bootstrap (ubuntu-22.04, 3.10)	53s
bootstrap / bootstrap (ubuntu-22.04, 3.11)	50s
bootstrap / bootstrap (ubuntu-22.04, 3.12)	58s
bootstrap / bootstrap (windows-latest, 3.8)	1m 48s
bootstrap / bootstrap (windows-latest, 3.9)	1m 50s
bootstrap / bootstrap (windows-latest, 3.10)	1m 43s
bootstrap / bootstrap (windows-latest, 3.11)	1m 50s
bootstrap / bootstrap (windows-latest, 3.12)	1m 35s
bootstrap / bootstrap (ubuntu-20.04, 3.6)	57s
pytest / pytest (macos-latest, 3.8)	1m 54s
pytest / pytest (macos-latest, 3.9)	58s
pytest / pytest (macos-latest, 3.10)	1m 13s
pytest / pytest (macos-latest, 3.11)	52s
pytest / pytest (macos-latest, 3.12)	54s
pytest / pytest (ubuntu-22.04, 3.8)	3m 5s
pytest / pytest (ubuntu-22.04, 3.9)	1m 35s
pytest / pytest (ubuntu-22.04, 3.10)	4m 32s
pytest / pytest (ubuntu-22.04, 3.11)	1m 44s
pytest / pytest (ubuntu-22.04, 3.12)	1m 52s
pytest / pytest (windows-latest, 3.8)	2m 9s
pytest / pytest (windows-latest, 3.9)	1m 51s
pytest / pytest (windows-latest, 3.10)	1m 51s
pytest / pytest (windows-latest, 3.11)	2m 4s
pytest / pytest (windows-latest, 3.12)	2m 18s
pytest / pytest (ubuntu-20.04, 3.6)	1m 4s
	48m 36s

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